Delete user on Che

[xcoulon]

Call Che to delete user account, but do not delete tenants if something wrong happened on Che side.

Fixes #ODC140

[codecov[bot]]

Codecov Report

Merging #813 into master will decrease coverage by 0.08%. The diff coverage is 58.1%.

@@            Coverage Diff             @@
##           master     #813      +/-   ##
==========================================
- Coverage   78.51%   78.43%   -0.09%     
==========================================
  Files          92       93       +1     
  Lines        8966     8995      +29     
==========================================
+ Hits         7040     7055      +15     
- Misses       1413     1420       +7     
- Partials      513      520       +7

Impacted Files	Coverage Δ
authorization/token/service/token_service.go	71.84% <26.31%> (-0.9%)	:arrow_down:
authentication/account/service/user.go	76.38% <33.33%> (-0.66%)	:arrow_down:
authorization/token/manager/token_manager.go	81.9% <66.66%> (-0.26%)	:arrow_down:
che/service/che_service.go	69.69% <69.69%> (ø)
configuration/configuration.go	83.65% <85.71%> (+0.03%)	:arrow_up:
...rovider/service/authentication_provider_service.go	72.22% <0%> (ø)	:arrow_up:

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[xcoulon]

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[xcoulon]

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